Changeover valves for regenerative ovens



Jan. 28, 1958 "F. DOLL CHANGEOVER VALVES FOR REGENERATIVE OVENS Filed Dec. a, 1952 Fig.3.

JNVENTOR V FRANZ DOLL United. States Patent ice This invention relatestochangeover valvesfor regener- 'atiVe' ovens; particularly regenerative coke oven batteries fibr changing over' the directionof flow" of the-producer gas and waste heat'with a fluiddip'sealclosure;

Changeover cup valvesprovided with a' liquid. dip; seal give an etr'ective, and" secure: sealingso: long'as, when" employed as changeover valves fonpro'ducer gas'andwaste heat" in regenerative ovens; they are' filled with a" liquid which does DOtIVaPOIiSCtOO' readily atthe high waste heattemperatures: Such' changeover valves 'with', aliquid sealhave, however, the disadvantagethat--the solid constituents'of the waste gases whichreadilydepositon'the abutment surfaces of the liquidcups contaminate thesealing cups so' that in'the course of timethevalve' seat'sur- 'faces of l the gas outlet1wall1of the 'cup' become encrusted and proper sealing no' longer takes place.

According to" the present invention this disadvantage is avoidedby arranging in' thesealing cups ofth'e change over valves annular immersion bodies' occupying approximately the horizontal cross section oftlresame'andfloating on the sealing liq iid ,and.ha,ving-tashap,e and size such that the immersion body upon the imposition of the valve disc in the sealing liquid is forced with this di so into the sealing; liquid. By means of suchgoperationtofiannular floating body substantially. coyering the; sealing liquid:it:is-. found that only negligiblequantitiesmf the solid constituent deposited from thewaste gases zcan pass into the liquid of the immersion cupse.

Accordingto the invention the. upper siderofi tlre immersion body is,const r ucted, to extend obliquely downwards and inwardly'from the outer -wall of the changeover valve-tot theupperedg'esofii'theninner gas :outlet wall of the liquid cup, when the body is floating on :thesealing liquid of the immersion cup with the waste heat valve opened. In this way the dust settling on the surface of the annular body drops over the gas outlet edge of the liquid cup into the waste gas passage.

According to a further feature of the invention, the immersion cup is constructed to taper conically downwards and the under side of the annular floating body is constructed to extend obliquely downwardly and outwardly to adapt it to this shape of the cup.

The invention further consists in connecting the immersion cups of all the changeover valves of one or both sides of the battery of a regenerative coke oven battery, by means of a connecting pipe connected in series with an equalising vessel for adjusting the liquid level, from which the sealing liquid, preferably at given time intervals, is pumped round through a circulation pipe.

By pumping the sealing liquid around in this way in the immersion cups of the changeover valves connected in series in the liquid line, a continuous renewal of the sealing liquid in each changeover valve is achieved. Preferably, the connecting points of the connecting pipe to the immersion cups of the separate changeover valves are arranged in the lower narrower trough portion of the conically extending part of the immersion cups, so that 2,821,504 Patented Ian: 28}. 1 958 with the high" speedy resulting at such. narrower part, through the'reduced cross section, the solids which may still'accumulatein the sealing liquid'are well'flush'ed out.

Oneform of construction ofthe-inventionis shown. by way of example. in the accompanyingdrawing.

Fig." 1' shows a, vertical'section through a changeover valve; with. a wasteilieat -valve disc in a closedposition, constrnctedaccording to the invention.

Fig. 2.is a.section:-similar to Fig; lwith the-waste heat. valve disc in open, position;

Fig; 3" showsdia'grammati'cally'the changeover valve with a liquid circulating pump vessel.

The changeover. valve is connected through the interior off'its housing 1 and a'branch pipe liwith'theregenerator 3', notshown in'detailg which is traversedat certain time intervals by producertgas or waste heat. Through an adjacently; disposed changeover valve, not .shown in the drawing, airjis'- suppliedito'the neighbouring regenerator, or wasteheatisdrawnotf; Thehousing 1' of the changeover valveis connected atits base with a waste heat passage'4 leadingto'" a' collecting passage. Producer gas is' delivered atS"throughthechangeover valve when the waste'heat valve Sigshownopen in Fig. 2, is closed,".as shown'in'Fig: 11 The changeover ofgas and waste heat is" effected; in the-known manner by reversal traction memberspthrough rollers or the; like. (notshown in the drawing) so that when the waste" heat' dip valve 8. is closed, axvalve; 6 arranged' in. the; gas supply pipe 5 is open" and viceversa: v

In'the 'lower' part of the housing. 1 of"the.'changeove r valvethere'is-also arrangedta conical" immersion cup 7 which is" tapered to narrow downwardly, and widen up;- wardl'y. Inthe liquidfilledimm'ersion cup 7"tl1'ereis also arranged anannular immersion float'b'ody 9"which"fl'oats on surface of "the liquid when the waste heat 'dip valve 8 is"opened., Theimm'ersion fl'oatbody 9has in vertical section: an upper surface 23 extending obliquely downwards fromttheouter'wallof the housing l to the upper inlet' extremity "or" gaszoutflow. edgeof the innerz'wall' of theimmersion" cup 7; as'can be seen from' Fig; 2'. The level 11 of the sealing liquid is k'CPtZSO high that in this position solid, constituents such" as" dust' or the like depositing on the upper oblique" surface"2 3 of the immersionbody'yere-entrained in the: stream of waste gas and taken along-into'the waste-*heatpassage 4 duringthe out fiow of wasteheat;

The floating body Q is constructed" underneath iiia similar manner to the upper surface of the immersion body but with the underside of the cone extending downwardly and outwardly so that it conforms substantially to the lower narrowing of the conical construction of the immersion cup 7 and can submerge sufficiently deeply into the immersion liquid therein. This immersion position can be seen in Fig. l and results, upon closing of the waste heat valve 8, from the application of the valve disc 8 onto the immersion body 9.

As can be seen from Fig. 3 the separate changeover valves 1 are connected in series with a liquid pipe 12 through which the sealing liquid is delivered from a container 13 through the immersion cups 7 of the individual changeover valves. A return flow pipe 15 leads finally to a pump 14 which is preferably set in circulation at definite time intervals and pumps the liquid in the container 13 in cycle through the series of valves 1.

As can be seen from Figs. 1 and 2, the connection for the inflow and outflow of the sealing liquid in the immersion cups 7 is arranged in the lower part of cups 7, so that at that region, on account of the narrower part of the tapered construction a high speed is given the liquid and in this way a good through-flushing is obtained.

Thecontainer 13 has a dividing wall 16. In the. one

3 compartment 18 formed thereby there opens areturn pipe 15 whilst in the other compartment 19 there extends an overflow pipe 20. The upper end of the pipe 20 deter mines, in accordance with the laws governing communicating pipes, the liquid level in the various changeover valves 1. In the compartment 18 of the container 13, there accumulate the solid constituents separating from the waste gas and these may be removed at certain intervals through a conical base 22.

The liquid level, determined by the pipe 20, is permanently maintained by the supply of fresh liquid at 24, whereby to make up for the loss of liquid. Excess liquid flows away through the overflow pipe 20. s

It is, however, possible to maintain the liquid level by means of a float valve, not shown in the drawing, regulating the supply of fresh liquid. v

I claim:

1. A liquid regenerator-reversing dip seal valve comprising: a housing having a regenerator connection for inflow of gas thereto from a regenerator, an outlet connection for outflow of gas from the housing, an annular cup around the outlet connection, a dip valve for the annular cup, and an annular float in the cup depressible by the dip valve on immersion of the dip valve in the cup to seal ofl the outlet connection to gas flow thereto from the housing; and characterized by a housing construction around the outlet connection that allows the upper part of the float to rise to a level above the inlet extremity of the outlet connection and by an upper surface for the float that extends obliquely substantially entirely across the cup in a direction downwardly to the inlet extremity of the outlet connection from a higher level above said extremity, when the float is emergent in liquid in the cup, in the open position of the dip valve, for oil-flow entrainment of solid constituents that may deposit on the top surface of the float into the outlet connection, by gas flow through the housing from the regenerator connection to the outlet connection, and a downwardly narrowing lower trough portion for the cup underneath the float, combined with a liquid outlet from the cup at the lower narrower trough portion thereof, for high liquid speed flushing-out of solids that may nevertheless collect beneath the float in the cup notwithstanding the action of the oblique top surface for the float, said liquid outlet comprising an equalizing vessel, an overflow outlet therefrom, an outlet pipe from the cup in series with the equalizing vessel and discharging therein above the overflow outlet therefrom, a pump in said outlet pipe, a return line from a level in the equalizing vessel below the overflow outlet to the cup, an overflow partition at a level intermediate the overflow outlet and the return line, said ,4 partition being disposed in the equalizing vessel between the inlet thereto of the outlet pipe from the cup and the -inlet to the return pipe from the vessel, and said overwhich the float is conical in cross-section with the apex of the float alongside the outlet connection but intermediate the outlet connection and the base of the cone of the float, and in which the outlet connection is tapered to widen toward the base of the conical float to provide the narrower high liquid speed flow area in the cup.

3. A liquid regenerator-reversing dip seal valve comprising: a housing having a regenerator connection for inflow of gas thereto from a regenerator, an outlet connection for outflow of gas from the housing, an annular cup around the outlet connection, a dip valve for the annular cup, and an annular float in the cup depressible by the dip valve in immersion of the dip valve in the cup to seal off the outlet connection to gas flow thereto from the housing; and characterized by a housing construction around the outlet connection that allows the upper part of the float to rise to a level above the inlet extremity of the outlet connection and by an upper surface for the float that extends obliquely substantially entirely across the cup in a direction downwardly to the inlet extremity of the outlet connection from a higher level above said extremity, when the float is emergent in liquid in the cup, in the open position of the dip valve, for off-flow entrainment of solid constituents that may deposit on the top surface of the float into the outlet connection, by gas flow through the housing from the regenerator connection to the outlet connection.

UNITED STATES PATENTS References Cited in the file of this patent 636,060 Strache Mar. 27, 1900 714,962 Sobolewski Dec. 2, 1902 1,975,621 Schafer Oct. 2, 1934 2,098,553 Reiner Nov. 9, 1937 2,334,612 Davis Nov. 16, 1943 2,690,764 Hofimann Oct. 5, 1954 FOREIGN PATENTS 15,271 Great Britain Feb. 5, 1914 

1. A LIQUID REGENERATOR-REVERSING DIP SEAL VALVE COMPRISING: A HOUSING HAVING A GENERATOR CONNECTION FOR INFLOW OF GAS THERETO FROM A REGENERATOR, AN OUTLET CONNECTION FOR OUTFLOW OF GAS FROM THE HOUSING, AN ANNULAR CUP-AROUND THE OUTLET CONNECTION, DIP VALVE FOR THE ANNULAR CUP, AND AN ANNULAR FLOAT IN THE CUP DEPRESSIBLE BY THE DIP VALVE ON IMMERSION OF THE DIP VALVE IN THE CUP TO SEAL OFF THE OUTLET CONNECTION TO GAS FLOW THERETO FROM THE HOUSING, AND CHARACTERIZED BY A HOUSING CONSTRUCTION OF THE FLOAT TO RISE TO A LEVEL ABOVE THE INLET EXTREMITY OF THE OUTLET CONNECTION AND BY AN UPPER SURFACE FOR THE FLOAT THAT EXTENDS OBLIQUELY SUBSTANTIALLY ENTIRELY ACROSS THE CUP IN A DIRECTION DOWNWARDLY TO THE INLET EXTREMITY OF THE OUTLET CONNECTION FROM A HIGHER LEVEL ABOVE SAID EXTREMITY, WHEN THE FLOAT IS EMERGENT IN LIQUID IN THE CUP, IN THE OPEN POSITION OF THE DIP VALVE, FOR OFF-FLOW ENTRAINMENT OF SOLID CONSTITUENTS THAT MAY DEPOSIT ON THE TOP SURFACE OF THE FLOAT INTO THE OUTLET CONNECTION, BY GAS FLOW THROUGH THE HOUSING FROM THE REGENERATOR CONNECTION TO THE OUTLET CONNECTION, AND A DOWNWARDLY NARROWING LOWER TROUGH PORTION FOR THE CUP UNDERNEATH THE FLOAT, COMBINED WITH A LIQUID OUTLET FROM THE CUP AT THE LOWER NARROWER TROUGH PORTION THEREOF, FOR HIGH LIQUID SPEED FLUSHING-OUT OF SOLIDS THAT MAY NEVERTHELESS COLLECT BENEATH THE FLOAT IN THE CUP NOTWITHSTANDING THE ACTION OF THE OBLIQUE TOP SURFACE FOR THE FLOAT, SAID LIQUID OUTLET 